June 2016 - ghc-tickets

[GHC] #12059: Add primop to query for pinned-ness of a ByteArray
by GHC 04 Jun '16

04 Jun '16

#12059: Add primop to query for pinned-ness of a ByteArray -------------------------------------+------------------------------------- Reporter: bgamari | Owner: Type: feature | Status: new request | Priority: normal | Milestone: 8.2.1 Component: Compiler | Version: 8.0.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- It would be useful to have, {{{#!hs isPinnedByteArray# :: MutableByteArray# -> Int# }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12059> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #4012: Compilation results are not deterministic
by GHC 04 Jun '16

04 Jun '16

#4012: Compilation results are not deterministic -------------------------------------+------------------------------------- Reporter: kili | Owner: niteria Type: bug | Status: new Priority: high | Milestone: 8.2.1 Component: Compiler | Version: 6.12.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Other | Test Case: Blocked By: 11362 | Blocking: Related Tickets: #10424 | Differential Rev(s): Phab:D910, | Phab:D1073, Phab:D1133, Phab:D1192, | Phab:D1268, Phab:D1360, Phab:D1373, Wiki Page: | Phab:D1396, Phab:D1457, Phab:D1468, DeterministicBuilds | Phab:D1487, Phab:D1504, Phab:D1508 -------------------------------------+------------------------------------- Changes (by ryantrinkle): * cc: ryan.trinkle@… (added) -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4012#comment:184> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #11223: Dynamic linker on Windows is unable to link against libmingwex
by GHC 03 Jun '16

03 Jun '16

#11223: Dynamic linker on Windows is unable to link against libmingwex -------------------------------------+------------------------------------- Reporter: Phyx- | Owner: Type: task | Status: new Priority: normal | Milestone: 8.2.1 Component: Runtime | Version: 7.10.3 System (Linker) | Keywords: | Operating System: Windows Architecture: | Type of failure: Compile-time Unknown/Multiple | crash Test Case: | Blocked By: Blocking: | Related Tickets: #10726 Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- The runtime linker seems to be re-exporting some of the symbols of `libmingwex` from the rts archive (using `SymI_HasProto`). Only a very small subset of symbols are re-exporting. If a symbol is needed that isn't re-exported (e.g. `log1p`) then this code can't be run in GHCi because it will result in a duplicate symbols error. A workaround The `rts` seems to be a special case again. The linker seems to ignore the `extra-libraries` from the `package.conf`, which explains why you can put anything you want in there and it'll still compile. {{{ 128 emptyPLS :: DynFlags -> PersistentLinkerState 129 emptyPLS _ = PersistentLinkerState { 130 closure_env = emptyNameEnv, 131 itbl_env = emptyNameEnv, 132 pkgs_loaded = init_pkgs, 133 bcos_loaded = [], 134 objs_loaded = [], 135 temp_sos = [] } 136 137 -- Packages that don't need loading, because the compiler 138 -- shares them with the interpreted program. 139 -- 140 -- The linker's symbol table is populated with RTS symbols using an 141 -- explicit list. See rts/Linker.c for details. 142 where init_pkgs = [rtsUnitId] }}} I've tried 2 approaches which haven't worked completely: 1. I tried removing the symbols from the export list and adding `libmingwex` to the rts's `package.conf`and have it just link against it. But turns out the `rts`'s `package.conf` is ignored on all platforms. I didn't want to have to make an exception for Windows here and I don't know why the other platforms also ignore it so I abandoned this approach. 2. I tried marking the symbols we're re-exporting as weak symbols, so there wouldn't be a change to existing code and would allow you to link against `libmingwex`. But unfortunately because of when the other libraries specified by `-l` are linked in, some of the symbols have already been used and thus aren't weak anymore. So I still get duplicate link errors. What I want to try now is leaving them as weak symbols, but loading `libmingwex.a` at `rts` initialization time. Much like how `kernel32` is loaded. This is hopefully early enough that the symbols haven't been used yet. Example (LogFloat.hs file): {{{#!hs module Main (main) where import Data.Number.LogFloat (log1p) main :: IO () main = print $ log1p 1.0 }}} `runGhc LogFloat.hs` will fail: {{{ Loading package logfloat-0.13.3.3 ... linking ... LogFloat.hs: ...\x86_64-windows- ghc-7.11.20151123\logfloat-0.13.3.3-4JZYNCXKwghOD60rvMUAcn\HSlogfloat-0.13.3.3-4JZYNCXKwghOD60rvMUAcn.o: unknown symbol `log1p' LogFloat.hs: LogFloat.hs: unable to load package `logfloat-0.13.3.3' }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11223> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #4012: Compilation results are not deterministic
by GHC 03 Jun '16

03 Jun '16

#4012: Compilation results are not deterministic -------------------------------------+------------------------------------- Reporter: kili | Owner: niteria Type: bug | Status: new Priority: high | Milestone: 8.2.1 Component: Compiler | Version: 6.12.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Other | Test Case: Blocked By: 11362 | Blocking: Related Tickets: #10424 | Differential Rev(s): Phab:D910, | Phab:D1073, Phab:D1133, Phab:D1192, | Phab:D1268, Phab:D1360, Phab:D1373, Wiki Page: | Phab:D1396, Phab:D1457, Phab:D1468, DeterministicBuilds | Phab:D1487, Phab:D1504, Phab:D1508 -------------------------------------+------------------------------------- Comment (by Bartosz Nitka <niteria@…>): In [changeset:"2046297ec03bdcd4901f69cd6ae03e84dc974683/ghc" 2046297e/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="2046297ec03bdcd4901f69cd6ae03e84dc974683" Document putSymbolTable determinism Like explained in the comment it's OK here. Test Plan: ./validate Reviewers: bgamari, austin, simonmar Reviewed By: simonmar Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2298 GHC Trac Issues: #4012 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4012#comment:183> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #4012: Compilation results are not deterministic
by GHC 03 Jun '16

03 Jun '16

#4012: Compilation results are not deterministic -------------------------------------+------------------------------------- Reporter: kili | Owner: niteria Type: bug | Status: new Priority: high | Milestone: 8.2.1 Component: Compiler | Version: 6.12.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Other | Test Case: Blocked By: 11362 | Blocking: Related Tickets: #10424 | Differential Rev(s): Phab:D910, | Phab:D1073, Phab:D1133, Phab:D1192, | Phab:D1268, Phab:D1360, Phab:D1373, Wiki Page: | Phab:D1396, Phab:D1457, Phab:D1468, DeterministicBuilds | Phab:D1487, Phab:D1504, Phab:D1508 -------------------------------------+------------------------------------- Comment (by Bartosz Nitka <niteria@…>): In [changeset:"9cc6fac5c096eb4120173495faf2c948f7a28487/ghc" 9cc6fac/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="9cc6fac5c096eb4120173495faf2c948f7a28487" Make FieldLabelEnv a deterministic set This lets us kill fsEnvElts function which is nondeterministic. We also get better guarantees than just comments. We don't do lookups, but I believe a set is needed for deduplication. Test Plan: ./validate Reviewers: bgamari, mpickering, austin, simonmar Reviewed By: simonmar Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2297 GHC Trac Issues: #4012 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4012#comment:182> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #12148: GHC 8 crash when building "chatter" library
by GHC 03 Jun '16

03 Jun '16

#12148: GHC 8 crash when building "chatter" library --------------------------------------+--------------------------------- Reporter: varosi | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Keywords: | Operating System: Windows Architecture: x86_64 (amd64) | Type of failure: None/Unknown Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: --------------------------------------+--------------------------------- While I try to build "chatter" library from GitHub with Stack with GHC 8.0 resolver I got that crash: [ 9 of 23] Compiling NLP.Corpora.Brown ( src\NLP\Corpora\Brown.hs, .stack- work\dist\b7fec021\build\NLP\Corpora\Brown.o ) ghc.exe: panic! (the 'impossible' happened) (GHC version 8.0.1 for x86_64-unknown-mingw32): Simplifier ticks exhausted When trying RuleFired Class op unsafeShiftR To increase the limit, use -fsimpl-tick-factor=N (default 100) If you need to do this, let GHC HQ know, and what factor you needed To see detailed counts use -ddump-simpl-stats Total ticks: 11403800 -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12148> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #4479: Implement TDNR
by GHC 03 Jun '16

03 Jun '16

#4479: Implement TDNR -------------------------------------+------------------------------------- Reporter: gidyn | Owner: Type: feature request | Status: new Priority: low | Milestone: Component: Compiler (Type | Version: 7.5 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by AntC): Replying to [comment:27 gidyn]: > There's a proposal for TDNR without syntax changes at SyntaxFreeTypeDirectedNameResolution. Hmm. That really is not up to being called a 'proposal'. Contrast its hand-waving with the careful detail in the original TDNR. I've added a couple of links to a ghc-users thread and to what Adam has just delivered in 8.0 DuplicateRecordFields. I think what Adam has delivered is a reasonable stab at the TDNR idea without changing any syntax. (I've made that point several times in the discussion.) I've not seen any detailed explanation that would disagree with that. (There is comment about the full ORF Part 3 Magic type classes.) If it was my call, and assuming this ticket 4479 is about TDNR, I would close this as fixed by DuplicateRecordFields. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4479#comment:31> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #4479: Implement TDNR
by GHC 03 Jun '16

03 Jun '16

#4479: Implement TDNR -------------------------------------+------------------------------------- Reporter: gidyn | Owner: Type: feature request | Status: new Priority: low | Milestone: Component: Compiler (Type | Version: 7.5 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by AntC): Then @gidyn, anybody reading this ticket is going to get totally confused -- as I am now. (That's why I'm replying here rather than privately.) Can you change the whole subject of a ticket like that? And then change it back much later? It's bound to invalidate a large proportion of the comments. I would have thought much better to close this ticket; open new one(s) for TDNR and dot postfix. For the record(!) again: TDNR includes two elements: 1. using dot postfix to signal 'here comes a record label'. 2. using type directed name resolution for that label at that use site. But the DORF proposal is purely to use dot postfix as syntactic sugar for function apply. Its purpose is (somewhat) incompatible with TDNR point 1, although the syntactic behaviour for dot is the same. As far as I can see, these two subjects should never have gotten on the same ticket. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4479#comment:30> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #10852: ghc 7.8.4 on arm - panic: Simplifier ticks exhausted
by GHC 02 Jun '16

02 Jun '16

#10852: ghc 7.8.4 on arm - panic: Simplifier ticks exhausted -------------------------------------+------------------------------------- Reporter: | Owner: andrewufrank | Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.2 Keywords: | Operating System: Linux Architecture: | Type of failure: Compile-time Unknown/Multiple | crash Test Case: | Blocked By: Blocking: | Related Tickets: Differential Revisions: | -------------------------------------+------------------------------------- i tried to compile (cabal install) chatter-0.5.2.0 on a armbian (debian jessie, with ghc 7.10.2-1 from testing, running on a cubietruck ARMHF Cortex A20) and get in file NLP.Corpora.Conll a panic: [ 9 of 23] Compiling NLP.Corpora.Conll ( src/NLP/Corpora/Conll.hs, dist/build/NLP/Corpora/Conll.o ) ghc: panic! (the 'impossible' happened) (GHC version 7.10.2 for arm-unknown-linux): Simplifier ticks exhausted When trying UnfoldingDone $fGSerialize:*:_$s<$> To increase the limit, use -fsimpl-tick-factor=N (default 100) If you need to do this, let GHC HQ know, and what factor you needed To see detailed counts use -ddump-simpl-stats Total ticks: 2748218 i do not notice anything particular in the code, except a very long data type with enumerated values. I tried with a higher value for tick-factor (1000) with no improvement. i will now try to run 7.10.2-2 from experimental. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10852> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #4012: Compilation results are not deterministic
by GHC 02 Jun '16

02 Jun '16

#4012: Compilation results are not deterministic -------------------------------------+------------------------------------- Reporter: kili | Owner: niteria Type: bug | Status: new Priority: high | Milestone: 8.2.1 Component: Compiler | Version: 6.12.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Other | Test Case: Blocked By: 11362 | Blocking: Related Tickets: #10424 | Differential Rev(s): Phab:D910, | Phab:D1073, Phab:D1133, Phab:D1192, | Phab:D1268, Phab:D1360, Phab:D1373, Wiki Page: | Phab:D1396, Phab:D1457, Phab:D1468, DeterministicBuilds | Phab:D1487, Phab:D1504, Phab:D1508 -------------------------------------+------------------------------------- Comment (by Bartosz Nitka <niteria@…>): In [changeset:"e2446c0d688d63e66fb1ae81cd2ebfa321ebc913/ghc" e2446c0d/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="e2446c0d688d63e66fb1ae81cd2ebfa321ebc913" Kill nameSetElems in findImportUsage nameSetElems is nondeterministic and while I think we don't need determinism here it doesn't hurt. Test Plan: ./validate Reviewers: ezyang, bgamari, austin, simonmar Reviewed By: simonmar Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2293 GHC Trac Issues: #4012 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4012#comment:180> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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